lua / httpd / vlm segfault on stream deletion

[#0](https://code.videolan.org/videolan/vlc/-/issues/0)  0x00007ffff6608305 in raise () from /lib64/libc.so.6
[#1](https://code.videolan.org/videolan/vlc/-/issues/1)  0x00007ffff660988b in abort () from /lib64/libc.so.6
[#2](https://code.videolan.org/videolan/vlc/-/issues/2)  0x00007ffff797b96b in vlc_thread_fatal (action=0x7ffff79a8c6f "locking mutex", error=35, function=0x7ffff79a9002 "vlc_mutex_lock", line=308, file=<value optimized out>) at posix/thread.c:210
[#3](https://code.videolan.org/videolan/vlc/-/issues/3)  0x00007ffff797cb4a in httpd_UrlDelete (url=0x7fffd00053d0) at network/httpd.c:1304
[#4](https://code.videolan.org/videolan/vlc/-/issues/4)  0x00007ffff797cf9d in httpd_StreamDelete (stream=0x7fffd0004650) at network/httpd.c:953
[#5](https://code.videolan.org/videolan/vlc/-/issues/5)  0x00007fffdb35ae7e in Close (p_this=0x7fffd0004338) at http.c:257
[#6](https://code.videolan.org/videolan/vlc/-/issues/6)  0x00007ffff795c6a4 in vlc_module_unload (module=<value optimized out>, deinit=0) at modules/modules.c:411
[#7](https://code.videolan.org/videolan/vlc/-/issues/7)  0x00007ffff7981cf2 in sout_AccessOutDelete (p_access=0x7fffd0004338) at stream_output/stream_output.c:292
[#8](https://code.videolan.org/videolan/vlc/-/issues/8)  0x00007fffdb55d5c7 in Close (p_this=<value optimized out>) at standard.c:442
[#9](https://code.videolan.org/videolan/vlc/-/issues/9)  0x00007ffff795c6a4 in vlc_module_unload (module=<value optimized out>, deinit=0) at modules/modules.c:411
[#10](https://code.videolan.org/videolan/vlc/-/issues/10) 0x00007ffff7981c23 in sout_StreamDelete (p_stream=0x7fffd00016c8) at stream_output/stream_output.c:731
[#11](https://code.videolan.org/videolan/vlc/-/issues/11) 0x00007ffff7981c9c in sout_StreamChainDelete (p_first=0x7fffd00016c8, p_last=0x0) at stream_output/stream_output.c:754
[#12](https://code.videolan.org/videolan/vlc/-/issues/12) 0x00007ffff7982c0f in sout_DeleteInstance (p_sout=0x7fffd0000f18) at stream_output/stream_output.c:140
[#13](https://code.videolan.org/videolan/vlc/-/issues/13) 0x00007ffff792d162 in DestroySout (p_resource=0x7fffcc1a6520) at input/resource.c:83
[#14](https://code.videolan.org/videolan/vlc/-/issues/14) 0x00007ffff792d305 in RequestSout (p_resource=0x7fffcc1a6520, p_sout=0x0, psz_sout=<value optimized out>) at input/resource.c:96
[#15](https://code.videolan.org/videolan/vlc/-/issues/15) input_resource_RequestSout (p_resource=0x7fffcc1a6520, p_sout=0x0, psz_sout=<value optimized out>) at input/resource.c:528
[#16](https://code.videolan.org/videolan/vlc/-/issues/16) 0x00007ffff792df98 in input_resource_Terminate (p_resource=0x3e9a) at input/resource.c:540
[#17](https://code.videolan.org/videolan/vlc/-/issues/17) 0x00007ffff7985981 in vlm_MediaInstanceDelete (p_vlm=0x7fffd400e708, id=1, p_instance=0x7fffcc1a5d90, p_media=0x7fffcc1a1580) at input/vlm.c:930
[#18](https://code.videolan.org/videolan/vlc/-/issues/18) 0x00007ffff7985cf9 in vlm_ControlMediaInstanceStop (p_vlm=0x7fffd400e708, id=1, psz_id=<value optimized out>) at input/vlm.c:1081
[#19](https://code.videolan.org/videolan/vlc/-/issues/19) 0x00007ffff7987e17 in vlm_vaControlInternal (p_vlm=0x7fffd400e708, i_query=<value optimized out>, args=<value optimized out>) at input/vlm.c:1283
[#20](https://code.videolan.org/videolan/vlc/-/issues/20) 0x00007ffff798893a in vlm_ControlInternal (p_vlm=0x3e9a, i_query=16153) at input/vlm.c:1327
[#21](https://code.videolan.org/videolan/vlc/-/issues/21) 0x00007ffff798902c in vlm_ControlMediaDel (p_vlm=0x7fffd400e708, id=1) at input/vlm.c:815
[#22](https://code.videolan.org/videolan/vlc/-/issues/22) 0x00007ffff79870a3 in vlm_vaControlInternal (p_vlm=0x7fffd400e708, i_query=<value optimized out>, args=0x6) at input/vlm.c:1240
[#23](https://code.videolan.org/videolan/vlc/-/issues/23) 0x00007ffff798893a in vlm_ControlInternal (p_vlm=0x3e9a, i_query=16153) at input/vlm.c:1327
[#24](https://code.videolan.org/videolan/vlc/-/issues/24) 0x00007ffff798e6a8 in ExecuteDel (p_vlm=<value optimized out>, psz_command=0x7fffcc1b4cee "", pp_message=<value optimized out>) at input/vlmshell.c:247
[#25](https://code.videolan.org/videolan/vlc/-/issues/25) ExecuteCommand (p_vlm=<value optimized out>, psz_command=0x7fffcc1b4cee "", pp_message=<value optimized out>) at input/vlmshell.c:905
[#26](https://code.videolan.org/videolan/vlc/-/issues/26) 0x00007ffff7985d7b in vlm_ExecuteCommand (p_vlm=0x7fffd400e708, psz_command=0x7fffcc1b4ce8 "del hb", pp_message=0x7fffdb9606a8) at input/vlm.c:268
[#27](https://code.videolan.org/videolan/vlc/-/issues/27) 0x00007ffff1e8a41d in vlclua_vlm_execute_command (L=0x7fffd4049170) at libs/vlm.c:116
[#28](https://code.videolan.org/videolan/vlc/-/issues/28) 0x00007ffff1c4b6d1 in ?? () from /usr/lib64/liblua.so.5.1
[#29](https://code.videolan.org/videolan/vlc/-/issues/29) 0x00007ffff1c56469 in ?? () from /usr/lib64/liblua.so.5.1
[#30](https://code.videolan.org/videolan/vlc/-/issues/30) 0x00007ffff1c4bb9d in ?? () from /usr/lib64/liblua.so.5.1
[#31](https://code.videolan.org/videolan/vlc/-/issues/31) 0x00007ffff1c4b247 in ?? () from /usr/lib64/liblua.so.5.1
[#32](https://code.videolan.org/videolan/vlc/-/issues/32) 0x00007ffff1c4b2c2 in ?? () from /usr/lib64/liblua.so.5.1
[#33](https://code.videolan.org/videolan/vlc/-/issues/33) 0x00007ffff1c46cb1 in lua_pcall () from /usr/lib64/liblua.so.5.1
[#34](https://code.videolan.org/videolan/vlc/-/issues/34) 0x00007ffff1c58b08 in ?? () from /usr/lib64/liblua.so.5.1
[#35](https://code.videolan.org/videolan/vlc/-/issues/35) 0x00007ffff1c4b6d1 in ?? () from /usr/lib64/liblua.so.5.1
[#36](https://code.videolan.org/videolan/vlc/-/issues/36) 0x00007ffff1c56469 in ?? () from /usr/lib64/liblua.so.5.1
[#37](https://code.videolan.org/videolan/vlc/-/issues/37) 0x00007ffff1c4bb9d in ?? () from /usr/lib64/liblua.so.5.1
[#38](https://code.videolan.org/videolan/vlc/-/issues/38) 0x00007ffff1c4b247 in ?? () from /usr/lib64/liblua.so.5.1
[#39](https://code.videolan.org/videolan/vlc/-/issues/39) 0x00007ffff1c4b2c2 in ?? () from /usr/lib64/liblua.so.5.1
[#40](https://code.videolan.org/videolan/vlc/-/issues/40) 0x00007ffff1c46cb1 in lua_pcall () from /usr/lib64/liblua.so.5.1
[#41](https://code.videolan.org/videolan/vlc/-/issues/41) 0x00007ffff1e81abd in vlclua_httpd_file_callback (p_sys=<value optimized out>, p_file=<value optimized out>, psz_request=0x7fffcc100010 "command=del%20hb", pp_data=0x7fffcc000ac8, pi_data=
    0x7fffcc000ac0) at libs/httpd.c:224
[#42](https://code.videolan.org/videolan/vlc/-/issues/42) 0x00007ffff797c9a7 in httpd_FileCallBack (p_sys=0x7fffd4040220, cl=0x7fffcc0009e0, answer=0x7fffcc000a78, query=0x7fffcc000a20) at network/httpd.c:434
[#43](https://code.videolan.org/videolan/vlc/-/issues/43) 0x00007ffff797eeb6 in httpd_HostThread (data=<value optimized out>) at network/httpd.c:2306
[#44](https://code.videolan.org/videolan/vlc/-/issues/44) 0x00007ffff6b7ab8f in start_thread () from /lib64/libpthread.so.0
[#45](https://code.videolan.org/videolan/vlc/-/issues/45) 0x00007ffff66b6e9d in clone () from /lib64/libc.so.6
[#46](https://code.videolan.org/videolan/vlc/-/issues/46) 0x0000000000000000 in ?? ()

added Severity::normal Type::bug Version::master git + 1 deleted label

changed milestone to %Bugs paradize

changed the description

assigned to @sebastien and unassigned @Courmisch

added Component::Core: VLM label and removed 1 deleted label

httpd is not recursive. You cannot add or remove an URL callback while inside an URL callback. And that's exactly what LUA VLM is doing.

I don't really care about VLM, so don't expect me to spend any extra time on this.

What are the steps to reproduce this?

Was something like http intf -> manage streams -> create then delete

I can't reproduce now.

Ah it deadlocks only if the stream is on the same host as the HTTP interface (so same port). So all of this can still be useful. Rather than disable the VLM controls from this interface, we could just prevent the user from using the same port, or something like that.

unassigned @sebastien